Bring chicken stock or water to a boil in a pot.
Add lemongrass, galangal, and kaffir lime leaves to the boiling stock. Simmer for 5 minutes to infuse the flavors.
Add mushrooms and bird's eye chilies. Cook for 2-3 minutes.
Add shrimp and cook until they turn pink and opaque, about 2-3 minutes. Do not overcook.
Stir in fish sauce, fresh lime juice, and Tom Yum chili paste (if using). Add cherry tomatoes (if using).
Taste and adjust seasoning as needed.
Remove from heat. Ladle into serving bowls and garnish with fresh cilantro. Serve hot.
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